import android.app.Activity;  import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.graphics.Canvas;  import android.graphics.PixelFormat;  import android.os.Bundle;  import android.view.MotionEvent;  import android.view.SurfaceHolder;  import android.view.SurfaceHolder.Callback;  import android.view.SurfaceView;    public class TransParentActivity extends Activity {      /** Called when the activity is first created. */      class MySurfaceView extends SurfaceView implements Callback{          float left,top;          Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.reen);          public MySurfaceView(Context context) {              super(context);              // TODO Auto-generated constructor stub              <span style="color:#ff0000;">getHolder().setFormat(PixelFormat.TRANSPARENT);//设置为透明              //getHolder().setFormat(PixelFormat.TRANSLUCENT);//半透明               getHolder().addCallback(this);              setFocusable(true);          }            @Override          public void surfaceChanged(SurfaceHolder holder, int format, int width,                  int height) {              // TODO Auto-generated method stub                        }            @Override          public void surfaceCreated(SurfaceHolder holder) {              // TODO Auto-generated method stub           doDraw();            }            private void doDraw() {              // TODO Auto-generated method stub              Canvas canvas=getHolder().lockCanvas();              canvas.drawBitmap(bitmap, left, top, null);              getHolder().unlockCanvasAndPost(canvas);          }            @Override          public void surfaceDestroyed(SurfaceHolder holder) {              // TODO Auto-generated method stub                        }                    /* (non-Javadoc)          * @see android.app.Activity#onTouchEvent(android.view.MotionEvent)          */          @Override          public boolean onTouchEvent(MotionEvent event) {              // TODO Auto-generated method stub              left=event.getX();              top=event.getY();              doDraw();                            return super.onTouchEvent(event);          }      }      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(new MySurfaceView(getApplicationContext()));                }        } 

<?xml version="1.0" encoding="utf-8"?>  <manifest xmlns:android="<a href="http://www.mamicode.com/http://schemas.android.com/apk/res/android">http://schemas.android.com/apk/res/android</a>"        package="rw.Trans"        android:versionCode="1"        android:versionName="1.0">      <uses-sdk android:minSdkVersion="10" />     <application android:icon="@drawable/icon" android:label="@string/app_name">          <activity android:name=".TransParentActivity"                    android:label="Transparent SurfaceView"                   android:theme="@android:style/Theme.Translucent"                    >                                 <intent-filter>                  <action android:name="android.intent.action.MAIN" />                  <category android:name="android.intent.category.LAUNCHER" />              </intent-filter>          </activity>     </application>  </manifest>